Revit- MySQL link

@MOJTABA256

Testing it in my environment would not prove much- I’d have to try and replicate exactly what you have, including the same database, authentication mode, ports etc

This is why I recommend SQLite- you don’t need to worry about any of this, just point it at a file,
I would recommend http://sqlitestudio.pl or ETLTools Database browser tools for working with the database outside of Dynamo

As I said- you should break it down into smaller steps and then you will be able to to work out where it is failing.
Did you do my step 3. i.e connecting to the database using something simple ? Such as Excel or the aforementioned tools

You graph is too complicated if you do not understand what it is doing.
Start off simple, and work up from there.The following demonstrate how to create a database, then verify it is working from Dynamo.